Journal of Japan Society on Water Environment最新文献_第10页

Ecological Risk Assessment of Copper in Coastal Areas of Japan: How will Bioavailability Considerations Change the Assessment Results? 日本沿海地区铜的生态风险评估:生物利用度因素如何改变评估结果?

Journal of Japan Society on Water Environment Pub Date : 2019-01-01 DOI: 10.2965/JSWE.42.105

R. Tai, W. Naito, S. Masunaga

{"title":"Ecological Risk Assessment of Copper in Coastal Areas of Japan: How will Bioavailability Considerations Change the Assessment Results?","authors":"R. Tai, W. Naito, S. Masunaga","doi":"10.2965/JSWE.42.105","DOIUrl":"https://doi.org/10.2965/JSWE.42.105","url":null,"abstract":"We conducted ecological risk assessment of copper in coastal areas of Japan. For risk assessment, we used a method in the initial environmental risk assessment conducted by the Ministry of the Environment, Japan, and several methods considering bioavailability, used for setting water quality criteria in Europe and the United States. The hazard quotient （ HQ ） method was used for risk characterization. Risk assessment was conducted using 1,622 copper concentration values from the Japanese coastal areas over the past 31 years that we were able to collect. As a result, the area with HQ exceeding 1 was 70.2% of the total in the screening level evaluation; considering bioavailability, it was 3.6 to 4.0%, and the risk characterization result changed depending on the hazard assessment method. Also, considering bioavailability, it was clear that there is a difference in the risk characterization result because water quality varies depending on the location even within the same bay. These results suggest that it is important to obtain toxicological data of species inhabiting Japan and copper concentrations in Japanese coastal areas and to examine what kind of evaluation method should be used for risk assessment.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82113270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Nutrients Runoff from a Forested Catchment during an Extreme Storm Event: A Case Study of the Headwaters of the Shimanto River in the Western Part of Kochi Prefecture, Japan in July, 2011 极端风暴事件中森林流域的养分径流:2011年7月日本高知县西部岛曼托河源头的案例研究

Journal of Japan Society on Water Environment Pub Date : 2019-01-01 DOI: 10.2965/jswe.42.219

Yoshiki Shinomiya, Yuichi Yokoyama

{"title":"Nutrients Runoff from a Forested Catchment during an Extreme Storm Event: A Case Study of the Headwaters of the Shimanto River in the Western Part of Kochi Prefecture, Japan in July, 2011","authors":"Yoshiki Shinomiya, Yuichi Yokoyama","doi":"10.2965/jswe.42.219","DOIUrl":"https://doi.org/10.2965/jswe.42.219","url":null,"abstract":"We investigated the loads of suspended solids （ SS ） , total （ TN ） and dissolved （ DN ） nitrogen during an extreme storm event （ total rainfall, 742 mm ） on 18 and 19 July 2011 in a forested mountain headwater catchment of the Shimanto River in the western part of Kochi Prefecture, Japan. We compared the extreme storm event with the normal event （ total rainfall, below 100 mm ） and the storm event （ total rainfall, 100 – 300 mm ） . The experimental catchment （ 73 ha ） has an underlayer of sandstone and is mainly covered with a secondary forest that comprises evergreen trees. Samples of streamwater were collected every two hours using an automatic water sampler during six events （ total rainfall, 44 – 742 mm ） . The load of TN during the extreme storm event was about 5 kg ha -1 event -1 , which is similar to the domestic average annual TN load （ 4.9 kg ha -1 yr -1 ） . The proportion of DN to TN in the specific cumulative load decreased sharply from 97% – 99% in the normal event and 77% – 97% in the storm event to 5% in the extreme storm event phase. The results clearly show that the load of particulate nitrogen was markedly greater than the load of DN during the extreme storm event.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80690072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Investigation on Cause of Lead Contamination in Irrigation Reservoir under Shooting Range Using Lead Isotope Ratio 利用铅同位素比对射击场灌溉水库铅污染原因的研究

Journal of Japan Society on Water Environment Pub Date : 2019-01-01 DOI: 10.2965/JSWE.42.35

O. Nagafuchi, K. Nakazawa, Ken’ichi Shinozuka

引用次数: 0

Evaluation of Nitrification Performance Using Nitrifying-DHS Reactor with Various Sponge-Pore Sizes for Breeding Tank of Marine Aquaria 海洋水族馆养殖池不同海绵孔径硝化- dhs反应器硝化性能评价

Journal of Japan Society on Water Environment Pub Date : 2019-01-01 DOI: 10.2965/JSWE.42.7

A. Furukawa, M. Hatamoto, Jun Kusaka, Kawamata Mutsumi, M. Mori, T. Hoaki, Takashi Yamaguchi

{"title":"Evaluation of Nitrification Performance Using Nitrifying-DHS Reactor with Various Sponge-Pore Sizes for Breeding Tank of Marine Aquaria","authors":"A. Furukawa, M. Hatamoto, Jun Kusaka, Kawamata Mutsumi, M. Mori, T. Hoaki, Takashi Yamaguchi","doi":"10.2965/JSWE.42.7","DOIUrl":"https://doi.org/10.2965/JSWE.42.7","url":null,"abstract":"The effect of sponge-pore size for a combined downflow hanging sponge (DHS) and upflow sludge blanket (USB) filtering system for the nitrification and denitrification, respectively, of a marine aquaculture system was evaluated. The nitrifying DHS reactor maintained the concentrations of total ammonia nitrogen and NO2 -N of the breeding water at 0.08 mg-N L and 0.05 mg-N L, respectively. The DO concentration in the breeding water was about 6.17 mg L without direct aeration of the tank. Despite the high DO of the denitrifying USB reactor influent, the nitrogen-removal performance was good and the NO3 -N concentration in the breeding water was maintained below the theoretical value. Regarding the effect of sponge-pore size for nitrification by the DHS reactor, the sponge with the smallest pore size, named CFH-30, had the fastest nitrification rate and sludge growth rate. Microbial community analysis of sludge contained in sponge revealed that sponge with the largest pore size had the highest detection rates for ammoniaoxidizing archaea and nitrite-oxidizing bacteria.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90459332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characteristics of River Sites with Elevated Concentrations of Linear Alkylbenzene Sulfonate: Implications for Water Environmental Management for Protection of Aquatic Life 线性烷基苯磺酸盐浓度升高的河流地点特征:对水环境管理和水生生物保护的影响

Journal of Japan Society on Water Environment Pub Date : 2019-01-01 DOI: 10.2965/jswe.42.201

Y. Iwasaki, H. Honda, Tohru Nishioka, Y. Ishikawa, Masayuki Yamane

{"title":"Characteristics of River Sites with Elevated Concentrations of Linear Alkylbenzene Sulfonate: Implications for Water Environmental Management for Protection of Aquatic Life","authors":"Y. Iwasaki, H. Honda, Tohru Nishioka, Y. Ishikawa, Masayuki Yamane","doi":"10.2965/jswe.42.201","DOIUrl":"https://doi.org/10.2965/jswe.42.201","url":null,"abstract":"Nationwide evaluation of the exceedance of environmental water quality standards （ EQS ） in the water environment plays a key role in establishing EQSs and effluent regulations. To understand the characteristics of river sites with annual mean concentrations of linear alkylbenzene sulfonate （ LAS ） that exceed the EQS, we compared （ 1 ） channel width as an indicator of river size, （ 2 ） surrounding land use, and （ 3 ） biochemical oxygen demand （ BOD ） as an indicator of organic pollution between “LAS-contaminated sites” with annual mean LAS concentrations of > 0.02 mg L -1 and “uncontaminated sites” with concentrations of ≤ 0.02 mg L -1 using water quality monitoring results from 2015-2016. Results indicated that, compared with uncontaminated sites, LAS-contaminated sites were found more frequently （ 1 ） in rivers with smaller and less variable channel width, （ 2 ） in rivers located in urban and residential areas with less forested and agricultural areas, and （ 3 ） in organic-polluted rivers indicated by higher annual mean of BOD. Generally, aquatic organisms in the natural environment are affected by many physicochemical factors including chemicals. Thus, as we demonstrated, the investigation of the physicochemical characteristics of water quality monitoring sites with higher concentrations of the chemicals of concern is valuable for evaluating management options that are substantially effective for protecting aquatic life.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"341 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75941291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of Nutrient Loads on Upper Trophic Level Species in Lake Biwa: Analysis Using Food Chain Model by Monte Carlo Method 营养负荷对琵琶湖上营养层物种的影响——基于蒙特卡罗方法的食物链模型分析

Journal of Japan Society on Water Environment Pub Date : 2019-01-01 DOI: 10.2965/jswe.42.133

Yuichi Sato, K. Hayakawa

{"title":"Effect of Nutrient Loads on Upper Trophic Level Species in Lake Biwa: Analysis Using Food Chain Model by Monte Carlo Method","authors":"Yuichi Sato, K. Hayakawa","doi":"10.2965/jswe.42.133","DOIUrl":"https://doi.org/10.2965/jswe.42.133","url":null,"abstract":"It has been pointed out that some waterbodies face “oligotrophication” owing to a decrease in nutrient loads. In this study, we predicted the effect of a change in future nutrient loads on variables such as the biomass of upper-trophic-level species, using the food chain model. The target area is Lake Biwa, where fish catches have fallen in recent years concurrent with a decrease in nutrient loads. Three models with different structures were developed and 100 patterns of parameter sets were selected for each model by the Monte Carlo method. As a result, the change in the biomass of phytoplankton, regardless of the model structure, tended to be roughly proportional to the change in nutrient loads in general. On the other hand, for the fish, differences in model structures and their prey strongly affected the biomass, and although inflow load increased, the biomass decreased in some cases. Considering the uncertainty of the prediction, we suggested that the addition of nutrients with the aim of increasing the fish populations would cause undesirable results in Lake Biwa such as a combination of deteriorating water quality and no increase in the fish populations.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"98 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76175400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Consideration of Transport of Ammonium Nitrogen in a Tidal River 潮汐河中铵态氮运移的研究

Journal of Japan Society on Water Environment Pub Date : 2019-01-01 DOI: 10.2965/JSWE.42.117

H. Yamanishi, Yuka Aoki

引用次数: 0

Disaggregation of Granular Sludge during Methane Fermentation Treatment for Methanol-containing Wastewater 含甲醇废水甲烷发酵过程中颗粒污泥的分解

Journal of Japan Society on Water Environment Pub Date : 2019-01-01 DOI: 10.2965/JSWE.42.67

Kazumasa Kamachi, H. Shinjô, Y. Tsukamoto, T. Tatsuzawa

引用次数: 0

Investigation of Seasonal Changes and Ecological Risk Assessments of Neonicotinoid Pesticides in Rivers in Osaka, Japan 日本大阪地区河流中新烟碱类农药的季节变化及生态风险评价

Journal of Japan Society on Water Environment Pub Date : 2019-01-01 DOI: 10.2965/jswe.42.227

K. Oyama, Y. Yabuki, A. Banno

引用次数: 3

Setting of Optimal Dosage of Polymer Flocculant in Centrifugal Dewatering Process for Digested Sewage Sludge 污泥消化离心脱水中高分子絮凝剂最佳投加量的确定

Journal of Japan Society on Water Environment Pub Date : 2019-01-01 DOI: 10.2965/jswe.42.269

Yoshihiro Suzuki, Keigo Endo, Wakana Taiko, K. Nukazawa, Yuichi Furuhashi, Nobuaki Chuganji

{"title":"Setting of Optimal Dosage of Polymer Flocculant in Centrifugal Dewatering Process for Digested Sewage Sludge","authors":"Yoshihiro Suzuki, Keigo Endo, Wakana Taiko, K. Nukazawa, Yuichi Furuhashi, Nobuaki Chuganji","doi":"10.2965/jswe.42.269","DOIUrl":"https://doi.org/10.2965/jswe.42.269","url":null,"abstract":"In the present study, we investigated the relationship between 11 properties of digested sludge and the optimal dosage ratio of polymer flocculant, assuming a conditioning process for sludge fed into a dewatering centrifuge. Furthermore, the study was focused on the supernatant phase （ mixed phase of colloidal matter and dissolved matter ） obtained by centrifugal separation of sludge, and a list of the properties of the supernatant phase was created. We then attempted to identify the properties that govern the optimal dosage. As a result, no correlation between total solids and the optimal injection ratio was observed. Therefore, the dosage was defined as the absolute quantity of polymer flocculant per 100 grams of sludge （ g/100 g sludge = % per sludge weight ） . As a result of examining its relationship with various properties, the strongest correlation was observed between the anion concentration of the supernatant phase and the optimal quantity of polymer flocculant, with r=0.73. A correlation was also found between the optimal quantity of polymer flocculant and the turbidity of the supernatant phase （ r=0.68 ） . We thus found that the optimal quantity of polymer flocculant can be predicted simply by centrifuging the raw sludge and measuring the turbidity of the supernatant phase.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89489778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0